Method for enhancing corrosion resisting property of Ni-W-P plating layer by adopting heat treatment technology

A kind of corrosion resistance, ni-w-p technology, applied in the coating, liquid chemical plating, metal material coating process and other directions, can solve the problem of reducing the corrosion resistance of the coating, to reduce the probability of damage, corrosion resistance The effect of improving and prolonging the service life

Inactive Publication Date: 2010-10-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that for Ni-P coatings, after heat treatment at a higher temperature, the coating changes from amorpho

Method used

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  • Method for enhancing corrosion resisting property of Ni-W-P plating layer by adopting heat treatment technology
  • Method for enhancing corrosion resisting property of Ni-W-P plating layer by adopting heat treatment technology
  • Method for enhancing corrosion resisting property of Ni-W-P plating layer by adopting heat treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] (1) Preparation of chemical plating solution

[0027] The contents of each component in each liter of plating solution are: nickel sulfate 20g / L, sodium tungstate 60g / L, sodium hypophosphite 20g / L, sodium citrate 70g / L, lactic acid 5ml / L, ammonium sulfate 20g / L, Sodium dodecylbenzenesulfonate 5mg / L, add deionized water to prepare plating solution, adjust pH value to 9.0 with sodium hydroxide solution;

[0028] (2) heating the above-mentioned plating solution to 90°C;

[0029] (3) Put the carbon steel sample into an alkaline degreasing bath for chemical degreasing at a temperature of 70°C, take it out after 15 minutes, and rinse with deionized water;

[0030] (4) Put the degreasing sample into the plating solution, and keep the temperature of the plating solution constant at 90°C;

[0031] (5) After 3 hours of plating, take out the sample and rinse with water to obtain a ternary Ni-W-P alloy;

[0032] (6) Heat treatment

[0033] The Ni-W-P coating...

Example Embodiment

[0035] Example 2

[0036] Corrosion resistance test: The Ni-W-P coating obtained in Example 1, the Ni-P coating after heat treatment under the same conditions, the as-plated Ni-P and Ni-W-P coatings were subjected to electrochemical tests at room temperature and 5% sulfuric acid. The obtained self-corrosion current density of each coating layer is shown in Table 1 below (the smaller the self-corrosion current density, the better the corrosion resistance).

[0037] Table 1 Corrosion performance comparison table of different coatings in 5% sulfuric acid

[0038] sample

Example Embodiment

[0039] Example 3

[0040] Corrosion resistance test: The Ni-W-P coating obtained in Example 1 was heat-treated at 600°C according to the method in Example 1 (6), and the coating and the Ni-P coating after heat treatment under the same conditions were plated as Ni-W-P coating. -P, Ni-W-P coatings were electrochemically tested in room temperature and 5% sulfuric acid, and the test results are shown in Table 2 below:

[0041] Table 2 Corrosion performance comparison table of different coatings in 5% sulfuric acid

[0042] sample

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Abstract

The invention relates to a method for enhancing the corrosion resisting property of a Ni-W-P plating layer by adopting a heat treatment technology. The method comprises plating solution preparation, chemical plating and heat treatment. The method is characterized by comprising the following steps of: placing an as-plated Ni-W-P plating layer into a resistance furnace; and keeping temperature for a certain time period at a certain temperature to obtain a heat-treated Ni-W-P plating layer. The invention has the advantages of enhancing the bonding force of the Ni-W-P plating layer, greatly improving the corrosion resisting property of the Ni-W-P plating layer and prolonging the service life of the Ni-W-P plating layer.

Description

【Technical field】 [0001] The invention relates to the technical field of Ni-W-P coating, in particular to a method for improving the corrosion resistance of Ni-W-P coating by adopting heat treatment technology. 【Background technique】 [0002] In recent years, electroless coatings, especially high-phosphorus electroless coatings, have been widely used in industry due to their amorphous characteristics, no defects such as grain boundaries and dislocations on the surface, and excellent corrosion resistance. However, with the increase of applications, some problems have also appeared. Since the electroless coating is cathodic, the quality problems of the coating itself, such as pinholes, pits formed during the plating process, and damage to the coating by external forces during use, often cause the coating to form galvanic corrosion in the corrosive medium. , so that the coating not only fails to protect the substrate, but accelerates the corrosion of the substrate. [0003] T...

Claims

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Application Information

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IPC IPC(8): C23C18/36C23C18/18C21D1/00
Inventor 徐宏姚志燕侯峰闫操徐鹏赵力伟
Owner EAST CHINA UNIV OF SCI & TECH
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